A side effect of any drug can be defined as the unwanted or undesired effect produced by the drug. The side effect can be major or in few medications minor that can be ignored. Side effects not only vary from drug to drug, but it also depends on the dose of the drug, the individual sensitivity of the person, brand or company which manufactures it. If side effects overweigh the actual effect of the medicine, it may be difficult to convince the patient to take the drug. Few patients get specific side effects to specific drugs; in that case, a doctor replaces the drug with another. If you feel any side effect and it troubles you, do not forget to share with your healthcare practitioner. The most common adverse reactions reported in at least 1 indication by greater than 10% of adult subjects treated with Valacyclovir and observed more frequently with Valacyclovir compared to placebo are headache, nausea, and abdominal pain. Converted to acyclovir by intestinal and hepatic metabolism Competes with deoxyguanosine triphosphate for viral DNA polymerase to inhibit DNA synthesis and viral replication Rapidly absorbed Bioavailability: ~55% (after conversion to acyclovir) Acyclovir (active drug) is widely distributed throughout the body, including brain, kidney, muscle, uterus, lungs, liver, spleen, vagina, and cerebrospoinal fluid (CSF) Protein bound: 13.5-17.9% Metabolized by liver; valacyclovir is rapidly and nearly completely converted to acyclovir and L-valine via first-pass effect; acyclovir is hepatically metabolized to a very small extent by aldehyde oxidase and by alcohol and aldehyde dehydrogenase (inactive metabolites) Half-life (normal renal function, adults): Acyclovir, 2.5-3.3 hr; valacyclovir, ~30 min Half-life (end-stage renal disease): Acyclovir, 14-20 hr Excretion: Urine (89%), feces (minimal) Valacyclovir comes as a tablet to take by mouth. It is usually taken every 8 hours (three times a day) for 7 days to treat shingles. To treat genital herpes it is usually taken twice a day for 5 days. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Do not take more or less of it or take it more often than prescribed by your doctor. Use this medication as soon as possible after symptoms appear. Continue to take valacyclovir even if you feel well. Do not stop taking valacyclovir without talking to your doctor. Will cialis work with low testosterone Valtrex daily use Viagra for cheap prices An allergic reaction to valacyclovir is not a common occurrence, although it can prove to be fatal if not treated immediately. Increased heart rate, difficulty breathing, and facial swelling are typical. Nov 14, 2014. Valtrex is the brand name for valacyclovir, an antiviral drug used to treat infections caused by certain types of viruses. In adults, it's prescribed. Do not take this medicine if you are allergic to valacyclovir or acyclovir Zovirax. you have any of these signs of an allergic reaction hives; difficulty breathing;. Valacyclovir is used to treat infections caused by certain types of viruses. In children, it is used to treat cold sores around the mouth (caused by herpes simplex) and chickenpox (caused by varicella zoster). In adults, it is used to treat shingles (caused by herpes zoster) and cold sores around the mouth. The viruses that cause these infections continue to live in the body even between outbreaks. Valacyclovir is also used to treat outbreaks of genital herpes. Valacyclovir decreases the severity and length of these outbreaks. In people with frequent outbreaks, this medication is used to reduce the number of future episodes. It helps the sores heal faster, keeps new sores from forming, and decreases pain/itching. This medication may also help reduce how long pain remains after the sores heal. Read the Patient Information Leaflet if available from your pharmacist before you start taking valacyclovir and each time you get a refill. It comes in the form of a tablet you take by mouth. Valacyclovir is available as a brand-name drug called Valtrex. Generic drugs usually cost less than the brand-name version. In some cases, they may not be available in every strength or form as the brand-name drug. This drug may be used as part of a combination therapy. This means you may need to take it with other medications. Valacyclovir is used to treat viral infections caused by a group of viruses called herpes simplex viruses. These infections include oral and genital herpes, shingles, and chickenpox. Valacyclovir allergic reaction Valacyclovir Hydrochloride FDA Label - Caplet AIDSinfo, Valtrex Valacyclovir - Side Effects, Dosage, Interactions - Drugs Prednisone white blood count A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including rash, itching/swelling especially of the face/tongue/throat, severe dizziness, trouble breathing. Valacyclovir Oral Uses, Side Effects, Interactions, Pictures.. Valacyclovir - CardioSmart. Valacyclovir Oral Uses, Side Effects, Interactions,. The Interactive Dermatology Atlas web site does not define a standard of care, nor is it intended to dictate an exclusive course of diagnosis, treatment or management. Valtrex valacyclovir is an antiviral medication used to treat infections with. Get emergency medical help if you have signs of an allergic reaction hives; difficult. General Facial edema, hypertension, tachycardia. Allergic Acute hypersensitivity reactionsUse Valacyclovir with caution. Do not drive or perform other possibly unsafe tasks until you know how you.